The expression "negative 8 minus 7" can be simplified as -8 - 7. To subtract a positive number from a negative number, you can add the opposite. Therefore, -8 - 7 is the same as -8 + (-7), which equals -15.
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-7 minus -4 is -3
-16 minus -9 is -7
(-3) - (-7) = (-3) + (+7) = (-3) + 7 = 4
9/10 minus 7/8 is 1/40
-16 - 8 = -24